Chain-saw.



2 SHEETS--BHEET 1.

PATENTED MAY 9, 190.5.

J. A. WALLER.

CHAIN SAW.

APPLICATION FILED JULY 11, 1904.

PATENTED MAY 9, 1905.

0 2 SHEETS-SHEET 2 No. |789,512. Patented. May 9, 1905'.

Nimes STATES PATENT Onnicn.

JOHN A. VALLER, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONEJIHIRI) 'IO HENRYO. ANDERSON, OF CHICAGO, ILLINOIS.

SPECIFICATION forming part of Letters Patent No. 789,512, dated May 9,1905.

Application filed July 1l, 1904. Serial No. 216,159.

T "f7/Z 11j/wmf I? mf/fl/ 007/1/037'70: the desired extensibility.Mounted on the 50 Beitknown that I, J'ouN A. VVALLER, a citiframe 6 atl0 are two forwardly-extending Zen ofthe United States of America, andaresiarms 11, each carrying at its outer end a dent of Chicago, in thecounty of Cook and sheave 12, journaled on a vertical The 5 State ofIllinois, have invented certain new inner ends of the arms 11 areslotted at 13 and useful Improvements in Chain-Saws, of and areconnected to a cross-bar 14 by means 55 which the following is aspeciiication. of a bolt 15, having an enlarged head 16. A

The main object of my invention is to proshaft 17 is journaled insuitable bearings on vide an improved form of flexible chain-saw theframe 6 and extends through the heads 16 IO particularly adapted forusein tree-felling'matransversely of the arms ll. The shaft 17 chinosand in places not accessible to a bandli-as, respectively, right andleft hand threadsaw of the usual construction. I accomplish edengagement with the heads 16 and is adapt these objects by the deviceshown in the aced to move the sheaves 12 toward or away companyingdrawings, in whichfrom each other through movement of the 'f5 Figure 1is a top plan of a tree-felling mahand-wheel 18. The cross-bar 114 isslotted chine provided with a chain-saw constructed to permit of thedesired movements of the according to my invention, the motor for bolts15. The chain-saw 3 consists of a plusupplying power to the same beingomitted. rality of toothed sections 19, pivotally con- Fig. 2 is a sideelevation of the same. Fig. nected together by means of links 20, and is2O 3 is an enlarged detail in plan, partly broken mounted on the iiangedsheaves l2 and the away, showing the construction of the chainflangedsprocket-wheel 2l, which lie in the 70 saw. Fig. I is a transversesection of the same horizontal plane. The sprocket-wheel same. Fig. 5 isa section on the line 5 5 of 21 is rigidly mounted on a shaft 22,journaled Fig. 1. Fig. 6 is a view of the toothed face in the frame 1and driven by thcinotor, which 25 of the saw. Fig. 7 isa section of thesprocketis not shown. The sprockets on the wheel 21 wheel 21, showingthe sprockets thereon for are made in the form of radial ribs on theinengaging the links of the chain. nei' faces of the flanges and enterthe spaces I lihe device shown consists of a carriage combetween theends of the sections 19 of the saw. prising a rectangular frame 1,supported on In the device shown the carriage is con- 30 wheels Qandprovided with a horizontally-dis trolled by meansofreaiwardly-extendinghanposed chainsaw 3, together with suitable mol dles23, which are shown partly broken away 8O tive power for driving thesaw. The motor in the drawings. 'Ilie chainsaw consists of an ispreferably of a type that is easily portable, endless link beltcomprising a series of toothed suchasagasoleiie-engine,andhasbeenomittedsections 19, pivotally connected together 3 5 from the drawings, `sinceit is accessory to the by means of links Q0. lilie links 2O prefermainfeatures of my invention. ably consist of straight bars, and thesections Mounted on the forward end of the frame 19 are each preferablyformed of a single 1 is a horizontal sliding frame 6. The frame piece ofsheet metal bent upon itself to forni 6 is slidable on the frame 1 in aforward and parallel plates lying at each side of the links 40 backwarddirection, and its position is con- 20 and connected thereto by means ofpivots trolled by means of the threaded shaft 7, `which 24, preferablylocated a considerable distance is operated by means of a hand-wheel 8.The inward of the ends of the links 20. Each of frames 1 and 6 areconnected together by the side plates of the section 19 is providedmeans of straps 9. One set of said straps is with a plurality ofsaw-teeth 25 on one edge 45 secured to the side bars of the frame 6 andexof the same. 'Ihe teeth on one plate extend tends around thecorresponding side bais of along the front half of said plate, while thethe frame 1, while the other set of straps is teeth on the other sideplate of the same secsecured to the frame 1 and extends around the tionextend along the rear half of the section.

side bars of the frame 6, thus permitting of Thus the group of teeth oneach plate is op posed to a space on the other plate, rendering itimpossible for sawdust to become jammed between the two series of teeth.The teeth on each plate are also oppositely beveled, as shown in Fig. 3.Alternate teeth L,in each group are set outward, as shown in Fig. 4. Inthe form of link shown in the drawings each section is provided with agroup of three teeth on each of its side plates,l the middle tooth ofeach group being straight and the other teeth being' bent outwardly. Theoutward disposition of some of the teeth causes the eut made made by thesaw to be considsiderably wider than the thickness of the main part ofthe belt, and the straight teeth serve to tear out the material betweenthe cuts of the teeth which are outwardly set. The pivots 24 are locateda considerable distance inward of the ends of the links 20, and the backpart 26, which connects the two side plates of the sections 19, servesas a stop for engaging the ends of the link 20 and preventing the sawfrom bending to a curvature which is concave on the toothed side of thesaw. As the saw bends in the opposite direction through pivotal movementbetween the links, the ends of the links 20, which extend beyond thepivots 24, move outwardly along the teeth 25 of the cutting-sections andbrush off any sawdust which may cling to the teeth.

The method of connecting adjacent links and sections which is hereinshown may be applied to devices other than chain-saws. This feature isnot broadly claimed herein, but is shown and claimed in my copendingapplication for'patent on chains, filed September 24, 1904, Serial No.225,850.

One of the arms 11 is provided with an extension 27, which is adapted toengage the side of the tree and prevent the carriage from being forcedaway from the tree through the action of the saw, when the saw is drivenin the direction indicated by the arrow 24 in Fig. 1.

The operation of the device shown is as follows: The side bars 11 areadjusted laterally to bring the sheaves 12 to a position correspondingto the width of the tree which it is desired to cnt. This adjustment ise'ected by turning the hand-wheel18. It is desirable that the sheaves 12be as close together as practicable during the operation of sawing atree. Any slackening or tightening' of the saw due to the adjustment ofthe arms 11 may be compensated for by extending or contracting the frameof the carriage by turning the hand-wheel 8. lt will be seen that thepeculiarstructure of the links of the saw permits the same to run freelyon the sprocketwheel and guiding sheaves, but prevents backward yieldingof the part of the saw which is between the sheaves 12 and engages thetree.

To 'fell a tree by means of the machine construction shown may bealtered without departing from the spirit of my invention.

What I claim as myrinvention, and desire to secure by Letters Patent,is-

1. As an article of manufacture, a saw comprising a series of alternatelinks and sections, each of said sections comprising a pair of parallelplates spaced apart for receiving the ends of the adjacent links, eachof said plates having teeth along one edge to form the cutting edge ofthe saw, said links and sections being pivotally connected together, andthe links being extended beyond the pivotal axes to form parts adaptedto sweep across the sections when the saw is bent as in passing around asheave, substantially as described.

2. As an article of manufacture, a saw comprising a series of alternatelinks and sections, each of said sections comprising a pair of parallelplates spaced apart for receiving the ends of the adjacent links, eachof said plates having teeth along one edge to form the cutting edge ofthe saw, said links and sections being pivotally connected together, andsaid links and sections being formed to permit bending of the saw convexto the cutting edge and prevent concave bending of the cutting edge,substantially as described.

3. As an article of manufacture, a saw comprising aseries of alternatelinks and sections, each of said sections comprising a piece of metalbent upon itself to form a pair of parallel plates spaced apartforreceiving' the ends of the adjacent links, each of the plates havingteeth along' the edge opposite the bend to form the cutting edge of thesaw, said links and sections being pivotally connected together on axestransverse to the cutting edge of the saw, and the links being extendedbeyond their pivotal axes to engage the sections and prevent the sawfrom being bent to a curvature which is concave on the cutting edge,substantially as described.

4L. As an article of manufacture, a saw comprising a plurality oftoothed sections each having a pair of parallel cutting edges on oneside thereof and each of said edges having' thereon a plurality ofteeth, the teeth on each cutting edge being alternately straight andoutwardly set, and links pivotally connecting said sections to form aflexible belt, substantially as described.

Signed atChicago this 6th day of July, 1904.

JOHN A. WALLER.

Vitnesses:

JOHN C. Linn, EUGENE A. RUMMLER.

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